Jump to content

Engine swap for a 73' 620


Recommended Posts

  • Replies 4
  • Created
  • Last Reply

Top Posters In This Topic

Top Posters In This Topic

Easy... L20B came in the '75-'79 620 so will fit perfectly and the stock tranny will bolt up. The differences are that it's 3/4" taller... no biggie on a truck. The exhaust manifold is a single large pipe and not a double into a collector like yours. You will need the L20B flywheel and clutch, yours won't fit. Get the motor mounts too just in case. Years ago I put an L20B into a 521 and I don't remember any problems. Easy... no headaches. 10-15 more horse and more torque.

Link to comment
  • 2 weeks later...
make sure if you get a l2ob out of a car that you swap the oil pans. just make sure you have a truck oil pan. i got my l20b from a 80 720 and put it in my 72 521.:D


That will only work with an '80 2wd oil pan if you find one.

Link to comment

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...

Important Information

By using this site, you agree to our Terms of Use.